The one name which Muslims hate and fear most is that of Chengiz Khan. He is a spectre which has haunted Muslim historians for centuries. He swept like a tornado over the then most powerful and extensive Islamic empire of Khwarazm. In a short span of five years (1219-1224 CE), he slaughtered millions of Muslims, forced many others including women and children into slavery, and razed to the ground quite a few of the most populous and prosperous cities of the Muslim world at that time.